This is a set of two books. There is a stain on pages 144 and 145 of "Zannen na Ikimono Jiten" as shown in the image. Please understand that these books have been stored by a private individual, and we appreciate your purchase if you can accept this. Fun! The Mysteries of Evolution: The Zannen na Ikimono Jiten Series, Continued The Disappointing Creatures Encyclopedia Dictionary Elementary School Students